OpenEVSE + PV divert + Fronius Smart Meter + zero-feed-in

[Bill.Thomson]

@graememk

is there any way to measure the solar radiation,

There is, but it’s not a low cost solution.

The answer is one of these:

SP-215-SS: Amplified 0-5 Volt Pyranometer

Price tage varies wildy. Anywhere from 279 to 600 USD depending on where it’s purchased.

I remembered reading about it in this thread:

PhotoTX calibrated solar irradiance sensor

PhotoTX A single channel, laboratory grade Pyranometer, (broad frequency, high precision light intensity sensor whose output is calibrated to measure irradiance in watts/m2). When we multiply its output by the size of our array, we get an instantaneous view of how much solar power we are capable of harvesting at any given moment. This is very important, because in an off-grid situation, you may not be harvesting all of the available energy, e.g., when the batteries are full (floating), or w…